
Rotator Cuff Muscles
The rotator cuff also known as the SITS muscles, is a group of muscles and their tendons that act to stabilize the human shoulder and allow for its extensive range of motion. Of the seven scapulohumeral muscles, four make up the rotator cuff. The four muscles or SITS muscles are: supraspinatus muscle, infraspinatus muscle, teres minor muscle, and subscapularis muscle. The rotator cuff muscles are important in shoulder movements. The rotator cuff muscles also perform multiple functions, including abduction, internal rotation, and external rotation of the shoulder. All 4 of these muscles originate at the scapula or shoulder blade, extending into strong tendons that wrap around the ‘ball’ or humeral head to form something like a thick band or cuff. It ensures that the humerus does not pop out of the socket of the glenoid cavity when we rotate the shoulder or extend our arm.
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